Mike Pelly wrote:
>Why does a gallon of liquid propane need to be pressurized at 172 PSI to
>stay contained in liquid form and gasoline stays liquid at room temperature?
>
>
Those are its physical properties. Asking this question with
respect to internal combustion is a bit like asking why ice floats.
It's a matter of density at pressure and temperature.
>I use the example of propane to illustrate how a vapor mixes so completely
>with air (unlike a sprayed liquid) There are many reasons why propane and
>gasoline are different including their densities and length of carbon
>chains.
>
Despite propane being a vapor at atmospheric pressure and ambient
temperatures, there is still a finite amount of energy available in a
given volume of liquid propane. It has a LOWER energy density than
gasoline, hence, even though it's a vapor and mixes completely with air,
propane delivers less energy per liter than gasoline. In fact, because
gaseous fuels in general actually displace air in externally-mixed fuel
management systems, propane normally delivers about 10% LESS power than
gasoline.
I'm writing this from many years of actual experience in burning
propane as an automobile fuel. I've built engines for propane, too, and
by virtue of squeezing the intake charge harder (higher compression
pressure) I managed to equalize fuel economy between gasoline and
propane in my old Pontiac sedan. The same technique can be used in ANY
high octane fuel, though. Methane, ethanol, methanol also benefit from
increased compression pressure. It has nothing to do with vaporized
fuel, and the improvements are incremental, at best.
We've been around this tree before. You vanish for awhile, then
come back with the same claims for astonishing fuel efficiency based on
vaporized gasoline, but you seem to lack understanding of how high
pressure, computer-feedback fuel injection works. Internal combustion
is a complex, dynamic process for certain, but at the end of all the
analysis, there is very little energy remaining in the exhaust gases of
a modern engine.
robert luis rabello
"The Edge of Justice"
"The Long Journey"
New Adventure for Your Mind
http://www.newadventure.ca
Ranger Supercharger Project Page
http://www.members.shaw.ca/rabello/
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